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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b97a1271920352789ce5ab34112c6391bafd1673ba29d49b5f1a7a214f5fcb6' 
  AND token = 'Pp5c4rAm83zgbRqYplxtujd6Tl0ALc6JKpflmzXx95s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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