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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f1f9c329ec928d9a9764bcf0e0100fb6d8b10a666a3adc0b623112a4f983682' 
  AND token = 'ec3ZThTE3aJmc63+AuhHZMWoHZwHuL8s344hF/+xWkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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