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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1660e4d41feaed0a627377ccedd1b822ee791b2ec0c709ae200a1b2e55513913' 
  AND token = 'FZKgiIOzaAy1k5mc9xtzyUF2fdUzSBrxVG8pVLSarTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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