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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '808344d811e12d6050c5d2287be659a21f46456db0f07ac63e2078b5e9ff6863' 
  AND token = 'MAyNCJAuaAe8L6SlNFmKf96k8erNpf9g7sDbxOI+xOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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