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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '351bddd6cbc9ae62dc4067df921def2b9533b466c7511ea4b1e44d0c59e8ba7f' 
  AND token = 'iyvSBjq03IFKLi85cGxWllOxlOg/S1V3qdxDA/2dex4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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