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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18a162503e2421203a712c272089062ea19adc502eeaa8eca0a4c7ff5f2eed73' 
  AND token = 'ckD/mz6ImKTrEoffQYH2DKPLhpjeENJQrbub93W7j00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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