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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a672d3a4fc7f23ff69be50bad80793e53c9bd110b0b30af6773d7e90e728aeb5' 
  AND token = 'chM+IdxPkhdPnQcGSeVXV0D31GBBI4dd2kopbAGseBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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