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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '596f3f34dcdce1c7491a8f1bfed6345c173070512d57eec11a84faa1b5586d07' 
  AND token = 'rY9AtoERwTyxeDWf5V3QdEez/m0GT5wro7YthIxKN5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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