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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8778cb93aae0c9eb3a3c3140a3164a5355a86989215629f7f52b747d888ae8ad' 
  AND token = 'IXKD9LqqenDtylqnok4OgeLrEevy5IlIFdmSx94O/Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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