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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6463ec643087819a91a7afe392230f41fc157b7bde650edbb8c205f3d29c42ec' 
  AND token = 'F6EyGYD/ZrtmswDQ1IL8Pk1IAZNXL0dCr78ko1aUk+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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