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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46fb1b2594fc8850870548e5826d5c19a1d72102ef3ba5855ea016f04b082e4b' 
  AND token = 'TE0ihgD1ElVxBz0ODt4aizPaVZnTrw8estqms+aPgPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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