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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91ecafd7671ad4955f657f593d87a852ad3de8b467ef9467864dac3f0ac62a1d' 
  AND token = '6Eo2WMXIuJcaJEtL6DgDGkbe8LvS3FfZ8H8EAuAHh+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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