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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '933fe89968758d40713c510df9c0d512911524601fe0a29a362a51adcce268be' 
  AND token = 'tg5FGBvaQqpAGVAtqFkd7lpa6EL5RNPLDCXw1h6vmQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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