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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8464ca900b9c88f728ef0376c1677051ba1e9feccdebe75011652cd6ebc8f41c' 
  AND token = 'm0qp+K4GTqLBOq9K00sEt9Kp1stDTJGcs2wQHBoUj24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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