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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f863d83d4b00d04feed28e9ddcc1c4a42f5b9208056b0f507a3e65ceeebc78cf' 
  AND token = 'n5UHlpG9IEfpUHw8khjnVVRfa3/tzQOgEiz5Uewey4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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