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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b48bcf8b95f5ae52f9af24808b58fc7efac69dbffd8fc4114b60170b59b4b31' 
  AND token = 'pk7oULQdVyLPxUxShk8YkwZ1euE8X4Rb5Th/PAF5xJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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