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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19f83dda8e884fddc052d4c7c79093c325553aca61ca70ea547b11f4043734a2' 
  AND token = 'HlpUsuIiUeT094k1UyIpVvG/Ws9xFLqpz651C1WMDGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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