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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e67d77ff24f4b0f80909683ff59caae3a893c6a6b934f88f9ef7932f6d74bab9' 
  AND token = 'LcpRiN5txdy+qLt0Fcc0MLjrrQZnVK+BodDQDMK2Yj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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