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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e8c186380ef6fcd95e3b90e7e1dda029dfee1cced6b4d0bc3d8cecbf6936de0' 
  AND token = 'DMjCgJObO388dbAio4gmEj3lWlSPRY/m/BbsVZDZ+3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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