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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb7bd84a6adee759605bc0b96f58b6bd3549135df06c2f3519c5ebd0ce0b0bde' 
  AND token = 'zcj1nkGtWrrR15yWF0kEdSoGi6v9YdoA+8zr2IdBqMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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