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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68c05978b3b7762e75c890713fc65727f91eccde9c61923cbebc273937129c84' 
  AND token = 'iZHjFyR+RCxbkPKyRKcnY7O/JfgqO+yK3/4AXyJIUMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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