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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76c167022156c5b1ce185174bed042a7ca6a5f6419a55ae1a62f100192d0ed54' 
  AND token = 'egU7dDNqZjKysfS98WD0mzhlNUeufcu4kW1ga3x3AQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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