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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2a3ce1b6eb53bef92cf622cec048650ee68257844c8c2860682ade560b1e468' 
  AND token = 'fuz8y7IxCt8rpzZ1tUyCV4QDmYH4zi+iNmLjPbpdP2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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