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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a1a0098fdffad514998f0f272c8b3f00457ab152a3dcb6f39b4c9d905687268' 
  AND token = 'w7IcBEWU96cMJBholUsA0AYfN9sh4nrYT6pY/EaDtys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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