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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de897c4b720b74e66bdbe6241fde23f8369a73012602f95b81158b93e6fbbe6e' 
  AND token = 'Lscr8S10q+7ot93+lZKSQ+bQxONW9IODA6g/kISGDiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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