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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5e4dc7d9bf0602a75d21a7e20d72a9655b2662e979bbf63eb6bde9f671921e2' 
  AND token = 'Eucq3AlDRf/VFLZcVcyfHrFDc/nulgBeq+lpZkOq/08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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