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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7742ebe6470fc73e8756650fdfe89c3bcb69a6417e0c3eb1dc51c1070c2770af' 
  AND token = '55W8ZD7a2MRUBU7WnoeGpo+MmhMkOxXJ3aLl+S5IEH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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