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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25313f03d511df2e5913c104fce6d9621db3344004d387dd3de1579025bb669e' 
  AND token = '8mlnQTC9mPQSfoRdYpG2DTX/9yyshjgxMYs5tJ11LyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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