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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caf53c2a35ee758e55824b551c9e672c7a6efe08f412244542bd50c3296c8791' 
  AND token = 'KvOkGGsA1sMSyJp5nVqRjYLSsSPFWuG5SbPeZG9kYVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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