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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec30e78e20084b8a63d87b926d67b6b2495cb1e6c44fd5bb4d24132c07be29a0' 
  AND token = 'ACzsK0ZuSTOt/6Lfmn92zfIhqzr1nnFOdtv8NtBEm7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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