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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '452469b858e984964759651f4babc514bb3fb25a7f26ce533b057c5d70460b81' 
  AND token = 'faE4iG9X1rfQBw87VpxH4HdrFwDsM23CIPEtmkCTMMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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