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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '408a6fb562d2bd50d23e491cb2f3a08e371a0c50d9e4e7769724b4d96cd15327' 
  AND token = 'jd1efX0sfHOcj0OU4Uk/WcJ0EGanqca3F84AN9evGj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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