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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e73435fc45110d4c7e4024e9445c473d55b6ad447fe1be15217040c3031bd2a' 
  AND token = 'prA77eCNCGL879sAxsCK851z9QeHkd7Z7tduw0t46aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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