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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a77adcd00524d8ae2987f557441202bc15560472d56e119f4fb81a4ec240f51b' 
  AND token = 'aRP1v+qt2HIYbYdbdvaxU/FxcJP1V0ymXHYgUGngqCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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