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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ac3babf190734c35a35a8465a4f41087eb18f8dcdcaa616d2c7b8751ca45afc' 
  AND token = 'r7w4zZC23kVCNyS5K0Bmlfqix3cVf6O6AkieYoq90tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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