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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d72a03a95e00b9a373c5c6bca37625c5ad0e2e861ce91c01a955bd1ef351b26' 
  AND token = '5G0yKvG/VzKr6ZCFPXgkP5UwJnIbT1ZFpp480Nfx684=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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