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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8050fee7f04adc8ed04d7a946e7fabb826f6385701efedb953d0fb89a2069425' 
  AND token = '8NqtPCepR5SFwpntqDiwIpNLm4Y9u2glt62VDlMeejI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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