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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8b8878025c6c350ba8df7aa2006e8794d2c1c6cbdddac2312ccf1f532ef3019' 
  AND token = 'a62r0o7l1DnZRD8DX3vOnO6gu2ODWaWFq7OAiohkeFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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