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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2345210edc6a4c85228e6f45b5ba0067e5f7abdb1f176d29c8a2a5f5a9b35df1' 
  AND token = 'pDYAIbtU5XC6lXgeZupXyMH83+Bs7SB4UtuBsNrzFOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}