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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71f810d32b1118fef31c7cf8f1d687289ec919a16ab954fdba7f643073afcd3c' 
  AND token = 'q29s1EbMh74UVMInWmLTKTsIXhIHfsU2oA5VWKrcu2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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