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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be7fb2bff03f497900d3a6f7db943e0206b905fc32b5015379ab0a00da86a885' 
  AND token = 'y30q2i8CWFqQUVpFZkiMcmshs9NQaa1npm5Tm0IZ2JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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