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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1255a1cc0e75c2db8eedf29fd86cd422a1b533bbb89e2edebc1e7c93426509b' 
  AND token = 'z1cpn5efo767qCuISKGx0udTV52eUZ17r9BpBeSDS9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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