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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf5eb3c867a3017ba2a6ff3e38b007d2df94a30dbbc5de8004c909cf83a2b3ce' 
  AND token = 'UMdgnxUbiUdAPdvgrOXwJzmuHx3Y4R1Vk8wuE2i++fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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