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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12accaa79d7745d02217b0f80585b58444bc59a136c7fccd6c17de2fc48f2b4d' 
  AND token = 'fsx6jQd4iiRT7UsX6G2R+QkizpUE5lViFae0ok8dDNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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