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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4eaf07d50d96ede9baae9387a707bf7d833ffd9c5cc4025c64176f1153f4a603' 
  AND token = 'B6+Gi8YMAgjXXxuprC3L2bLaATqAHIDcm6GtGOC5qSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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