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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d345738da896e87329a66a22ba74b1cee2b8db1e1b01985aac90f872866cee6' 
  AND token = 'BFcX5XBXgBcXUBwPrmby7cY1D2sPS/2LfiZCpEE1Wgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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