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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b2f847da3ec387b85ab763d5de37b7955f2a60ec4573ad080ac242b18102191' 
  AND token = '9Vp31w/z48AscCtUWqEHUAtvJ/bIePb9cHg5IsWwJTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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