SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6ebd10277b247f78440cf36957d5c8fddf6303ca792bcd0530a2f145335a03b' 
  AND token = 'E4R/r1E9djXkSyGNZmOyZwznLBuMNkaeggCXL+03w7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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