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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2aec02fd8e76edf38786830a5f03c9e418fc4d88ca3d5a8c783a147c103543eb' 
  AND token = '3UOdUFNw+fUtaGQQwcPBg1QuhmOw6ROVlqCH4PUIFUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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