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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '985809d96b8ade610954be78e67f0316d6648a8256930d95e168562c6e648317' 
  AND token = '2rBPRBFmM1IiQQaz9dx1IQWYrlG/db2JobpOdtV+C74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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