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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68d2dde581d335a9c3103890be11382aab6d45e0f3d7640be9af54cd2cef9dd4' 
  AND token = 'un7QilSE8Pu/Za2hA4SNmf36P+T3oFdI90zZIOfy3uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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