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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec865e795e6e1b5f4bdcef3c405208cda43fcf7a9cdff7c0f0d6be57bcefc44b' 
  AND token = 'zNyccUNrNHpu8Ikm6XeYgUvyF+BebJ+h2U8maA6zcS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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