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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72d2bd0bc51546ab700cfee7537df1155427dbc847cfd553c71099860f8286ea' 
  AND token = 'kacHyZKC2b47K4rOdJJAGhqSUoFnS0q3EeCTDwscRnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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