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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa96bc1635ee22804a2f1dc2ca45e89f75e74c32fa9026e6352661e3068d60c3' 
  AND token = 'Mkrhi5LHVYlln8BmFBTyUv4Jx4GP2iRN0aIZ8VQGM3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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